GO TRANSIT IN-FLOOR RADIANT HEATING SYSTEMS

Transcription

1 GO TRANSIT IN-FLOOR RADIANT HEATING SYSTEMS DESIGN GUIDELINES AND SPECIFICATIONS June 2012 Prepared by: SAB Engineering Inc. 588 Edward Ave. unit 25 Richmnd Hill, Ont. L4C 9Y6 Tel: Fax:

2 CONTRACT #IT-201X-EN-0XX SYSTEMS PAGE 1 f 37 TABLE OF CONTENTS 1. APPLICABILITY AND LIMITATIONS RFERENCES DESIGN CRITERIA AND PRINCIPLES General Heating Lads Indr Setpints Maximum Flr Surface Temperatures Maximum Under-Flr Cvering Temperature Thermal Zning Pipe spacing Pipe sizes Piping Layut Guidelines Fluid Heating Temperature Manifld Sizing Maniflds Lcatin Piping Layut Pump Selectin Cntrl Strategies GENERAL SYSTEM REQUIREMENTS Certificatin Equipments Perfrmance Requirements: Regulatry Cmpliance Manufacturer Credentials SUBMITTALS Prduct Data: Submit manufacturer s prduct submittal data and installatin instructins Submit the fllwing shp drawings, calculatins and reprts Submit the fllwing supprt dcumentatin: Submit the fllwing clse-ut dcuments DELIVERY, STORAGE AND HANDLING WARRANTY Warranty Perid fr PEX Tubing: Warranty Perid fr Maniflds and Fittings:... 15

3 CONTRACT #IT-201X-EN-0XX SYSTEMS PAGE 2 f Warranty Perid fr Cntrls and Electrical Cmpnents: Warranty may transfer t subsequent wners IN-FLOOR HEATING SYSTEM COMPONENTS Tubing Maniflds Fittings Accessries: Standards f Acceptance: ABOVE GROUND PIPING BETWEEN HEAT SOURCE AND MANIFOLDS Pipe And Tubing Fittings Fr Steel Pipe Fittings Fr Cpper Tubing Screwed Jints Valves Butterfly Valves Ball Valves Water Flw Balancing Valves Gages, Pressure And Cmpund Thermmeters Pressure/Temperature Test Prvisins ABOVE-GROUND PIPING INSULATION Fiberglass Pipe Insulatin Adhesive, Mastic, Cement Mechanical Fasteners Canvas Jacketing Metal Jacketing VERTICAL IN-LINE PUMPS Pumps Vibratin islatrs Accessries DIGITAL CONTROLS General Devices and Operatrs... 23

4 CONTRACT #IT-201X-EN-0XX SYSTEMS PAGE 3 f EXECUTION Examinatin In-Flr Tubing Installatin - Cncrete Slab-n-Grade Under-slab Insulatin Site Tests In-Flr Tubing Air Test - In-Flr Tubing Water Test - In-Flr Tubing Cleaning - In-Flr Tubing Balancing Acrss the Manifld - In-Flr Tubing Abve-Grund Piping Installatin Leak Testing Abvegrund Piping Flushing And Cleaning Piping Systems Abve-Grund Piping Insulatin Circulating Pumps BAS EXECUTION Sequence f Operatin Pwer Surces And Wiring Methds Installatin Of Temperature Sensrs In Piping Installatin f Slab Temperature Sensr Installatin f Space Temperature Sensr Installatin Of Autmatic Cntrl Valves And Actuatrs Cutting And Patching Identificatin And Labeling Of Cntrl Equipment Systems Hardware Cmmissining Substantial Cmpletin Inspectin Training... 37

5 CONTRACT #IT-201X-EN-0XX SYSTEMS PAGE 4 f APPLICABILITY AND LIMITATIONS 1.1 This specificatin sectin pertains t the supply and installatin f an in-flr radiant heating system. 1.2 This sectin shall be read in cnjunctin with the GO Transit/Metrlinx specificatins: Snw Melting Systems. 1.3 In the cntext f these specificatins, heating fluid means either the plyprpylene glycl used fr the snw melting system (since the heating plant is cmmn) r water (in the absence f a cncurrent snw melting system). The designer shall adjust the calculatins t suit the fluid used. 1.4 The fllwing cmpnents are nt cvered by this sectin: The heating surce fr the heating agent and all assciated cmpnents; they are included in the Snw Melting Systems specificatin and are fully applicable t this sectin. The building autmatin system (BAS) central hardware and sftware cmpnents (cntrl panels, sftware and graphics, server, etc); they are included in the Snw Melting Systems specificatin and are fully applicable t this sectin Mechanical General Cnditins including but nt limited t duties f cntractrs, material substitutins, shp drawings, cntractual bligatins; they are included in the Snw Melting Systems specificatin and are fully applicable t this sectin. Requirements fr testing, adjusting and balancing (TAB) f hydrnic systems are included in the in the Snw Melting Systems specificatin and are fully applicable t this sectin. 1.5 The fllwing cmpnents are cvered by this sectin: The in-flr heating piping, maniflds and accessries The rigid piping and accessries cnnecting the heating surce t the in-flr heating maniflds The pumping equipment assciated with the in-flr heating system The digital cntrl cmpnents (sensrs, valves, peratrs, wiring, relays, etc) assciated with the in-flr heating system 2. RFERENCES 2.1 Publicatins listed here are part f this specificatin t the extent they are referenced. Where n specific editin f the standard r publicatin is identified, the current editin shall apply. ASTM E84, Standard Test Methd fr Surface Burning Characteristics f Building Materials ASTM F876, Standard Specificatin fr Crsslinked Plyethylene (PEX) Tubing ASTM F877, Standard Specificatin fr Crsslinked Plyethylene (PEX) Plastic Ht- and Cld- Water Distributin Systems

6 CONTRACT #IT-201X-EN-0XX SYSTEMS PAGE 5 f 37 ASTM F2014, Standard Specificatin fr Nn-Reinfrced Extruded Tee Cnnectins fr Piping Applicatins ASTM F2080, Standard Specificatin fr Cld-Expansin Fittings With Metal Cmpressin- Sleeves fr Crss-Linked Plyethylene (PEX) Pipe CSA B137.5, Crsslinked Plyethylene (PEX) Tubing Systems fr Pressure Applicatins CSA B214, Installatin Cde fr Hydrnic Heating Systems ISO 9001, Quality Management Systems Requirements CAN/ULC S102.2, Surface Burning Characteristics f Flring, Flr Cvering and Miscellaneus Materials PPI TR-3 / 2007, Plicies and Prcedures fr Develping Hydrstatic Design Basis (HDB), Pressure Design Basis (PDB), Strength Design Basis (SDB), and Minimum Required Strength (MRS) Ratings fr Thermplastic Piping Materials r Pipe 3. DESIGN CRITERIA AND PRINCIPLES 3.1 General The building s structure and the flr finish installatin influences the decisin regarding the best radiant heating cnstructin methd. Fr best results, the flr cnstructin shuld be crdinated with the architect and structural engineer. Flr cnstructin methds play an imprtant rle in the perfrmance f the radiant heating system. The flr shuld allw fr the heat frm the pipes t dissipate readily and evenly t the heated space. Dwnward heat flw shuld be minimized by emplying adequate insulatin. 3.2 Heating Lads The system shall be sized t ffset the building heat lsses thrugh the envelpe. The heat lsses thrugh walls, windws, rfs, flrs, skylights, drs, etc. shall be calculated using an industry-accepted sftware such as Carrier HAP prgram r similar. Infiltratin lads thrugh static envelpe elements (such as windw frames, etc) shall nt be cnsidered, since the buildings are t be maintained at a slight psitive pressure by the ventilatin equipment. In areas expsed t high indr/utdr traffic, the infiltratin rate due t frequent exterir drs pening shall be calculated based n the estimated drs peratin, pening areas and temperature differential between indr and utdr. The methdlgy is described in detail in the ASHRAE Fundamentals Manual (Ventilatin and Infiltratin Air Leakage Thrugh Exterir Drs). At the latitude f the designer, a safety cefficient can be added t accunt fr the heat lsses thrugh the system (un-insulated maniflds, expansin tanks, etc.).

7 CONTRACT #IT-201X-EN-0XX SYSTEMS PAGE 6 f Indr Setpints The indr setpints will vary with the designatin and use f the space where the in-flr heating system is used. Additinal variables are the ccupied/unccupied schedules. The default values shall be crdinated with GO Transit fr each applicatin. Fr the purpse f heat lss calculatins with radiant heating systems the indr setpints nted abve may be lwered 2 t 4 F (1 t 2 C) cmpared t cnventinal perimeter basebards r frced-air heating systems. 3.4 Maximum Flr Surface Temperatures In rder t determine the required flr temperature utside the perimeter band, use the fllwing methdlgy: Based n the ttal heat lad calculatin, calculate the radiant flr heat utput requirement in Btu/h-ft 2 (W/m 2 ) fr each thermal zne using the fllwing frmula: Flr Heat Output = Ttal Heat Lad/Available Area Available area is nrmally less than ttal area. Deduct nn-heated areas where heating pipe cannt r shuld nt be installed, such as under walls, vending machines, islands r furniture. Calculate the radiant flr surface temperature that is needed t achieve the required heat utput int the rm. The flr surface temperature is the temperature at the uter surface f the finished flr. T calculate the flr surface temperature in F ( C), use the fllwing equatin: Flr Surface Temp = Flr Heat Output/HTC + Indr Temperature where the Heat Transfer Cefficient (HTC) is recmmended as 2.0 Btu/(hr-sq.ft.- O F) r W/m 2 -K The maximum flr surface temperature shall nt exceed 85 O F (29 O C), except fr the 3 ft wide perimeter band, where the temperature may be raised up t 90 O F (32 O C). If the flr surface temperature exceeds the advisable temperature set in these guidelines r the allwable flr cvering temperatures (see belw), take the fllwing actins: Reduce the heat requirements by imprving building envelpe efficiency Increase the radiant surface area t include nt nly the flr but als walls and/r ceilings Use supplemental heat (basebards, reheat cils)

8 CONTRACT #IT-201X-EN-0XX SYSTEMS PAGE 7 f Maximum Under-Flr Cvering Temperature Every flr cvering has a thermal resistance. The type and material used fr flring shall be crdinated with the architect. Flr prducts used with radiant heating systems shuld have high heat transmissin values (lw R-values) t achieve the best pssible heat transfer frm the pipes t the rm. Flr cverings shuld als be as thin and dense as pssible and be able t withstand the heat utput f the radiant panel. In rder t achieve the required Flr Surface Temperature, the temperature f the slab at the underside f the flr cvering needs t be higher, in rder t vercme the thermal resistance f the flr cvering. The thermal resistance f the flr cvering shall be calculated taking int accunt all the layers invlved (such as mrtar bed, final grut, ceramic tiles, etc.) Flr cvering materials have temperature limits dictated by their cmpsitin. The calculated temperature at the underside f the flr cvering shall nt exceed the value recmmended by the manufacturer. Fr specific flr finishes materials and thicknesses, crdinate with the architect. Avid under-flr cvering temperatures in excess f 100 O F (38 O C). If the under-flr cvering temperature resulting frm calculatins exceeds 103 O F (39.5 O C), re-select the in-flr pipe diameter and the pipe spacing. Typically, flr and under-cvering temperatures are cntrlled and mnitred by embedded temperature sensrs. 3.6 Thermal Zning A thermal zne is an area f temperature cntrl. Typically, a grup f ffices r similar will cnstitute a separate zne. Larger areas (such as cmmn waiting areas in a GO Transit statin) may be subdivided in several thermal znes, based n gegraphical rientatin and prximity t exterir walls. 3.7 Thermal expansin The design must allw fr absrptin f the mvement f the thermal mass f the flr slab. T prevent uncntrlled cracking and/r damage t the embedded piping, the architect shall segment the thermal slab int smaller sectins called thermal bays by emplying an apprpriate arrangement f mvement jints. The develpment f cracks in the flr r distrtin in the piping are unacceptable. The layut f the heating pipe and the flr slab jints must be crdinated with the architect and the structural engineer. Pipe circuits are t be planned and installed such that they d nt crss mvement jints. Mvement jints shuld nly be crssed by the cnnectin piping (circuit supply and return tails).

9 CONTRACT #IT-201X-EN-0XX SYSTEMS PAGE 8 f Pipe spacing GO Transit recmmends the pipe spacing be selected t prvide the mst cmfrtable flr surface temperature and the mst energy efficient system. Clser pipe spacing imprves the unifrmity f the flr surface temperature and lwers the heating fluid temperature, resulting in greater energy efficiency. The typical pipe spacing shall be: tiled flrs: 6 t 8 in the perimeter band and 6" t 9" in the field f the thermal zne (t prevent cncentrated ht and cld spts) carpeted flrs: 6 t 8 in the perimeter band and 6" t 12" in the field f the thermal zne ( t prevent cncentrated ht and cld spts) bare finished cncrete: depends f heat lss, up t 18" pssible. 3.9 Pipe sizes The embedded pipe sizes shall be selected as fllws: 5/8" diam fr circuits up t 400 ft 3/4" diam fr circuits up t 500 ft 1" diam fr circuits larger than 500 ft. The length f a particular circuit shall be based n the area f each thermal zne and the fllwing criteria: pipe spacing 6" - 2 ft pipe length per sq.ft f space. pipe spacing 8" ft pipe length per sq.ft f space. pipe spacing 9" ft pipe length per sq.ft f space. pipe spacing 10" ft pipe length per sq.ft f space. pipe spacing 12" ft pipe length per sq.ft f space. The ttal resulting length fr each circuit shall nt exceed the maximum value allwed fr a particular pipe diameter Piping Layut Guidelines Fllwing are sme basic pipe layut recmmendatins: D nt run pipes under built-ins (e.g., cabinets, windw seats, large appliances, raised hearths, stairs)

10 CONTRACT #IT-201X-EN-0XX SYSTEMS PAGE 9 f 37 Keep pipes a minimum f 6 in (15 cm) away frm the edge f the slab, walls and nailing surfaces, and ther lcatins where plates, fixtures r built-ins might be fastened int the flr Keep balanced circuit lengths within 10% f each ther Design separate circuits fr different rms, allwing better rm temperature cntrl Keep thermal znes reasnably sized D nt run circuit pipes acrss mvement jints Select the pipe size that is large enugh fr the applicatin 3.11 Fluid Heating Temperature GO Transit recmmends the lwest heating fluid temperature that will prvide the required panel surface temperature. This will minimize thermal stress n slabs and flr cverings, and minimize vershting f the desired ambient rm temperature. GO Transit suggests the fllwing criteria: temperature drp acrss the embedded circuits: 20 F (11 C). average fluid temperature (between supply and return): 110 F (43.5 C). T be nted: flr cverings, pipe spacing and selected indr temperature may have a significant impact n the average fluid temperature. Highly resistive flr cverings (e.g., carpet and padding) require the fluid temperature t be increased t vercme the resistance t heat flw thrugh the flr. Highly cnductive flr cverings (e.g., tile) require a lwer fluid temperature t prvide the same heat utput. The heating fluid temperature is als affected by the selected indr setpint selected and the pipe spacing. The cnsultant will check with the equipment manufacturer and make crrectins t the GO Transit temperature guidelines if s required. Optimizing the average fluid temperature may require changing previusly selected values fr pipe size and spacing. The designer will need t reiterate the previus calculatins with the newly selected values Manifld Sizing When sizing a manifld, several criteria must be taken int accunt: Maniflds are selected accrding t the pipe size, number f circuits and circuit flw rates. Smaller maniflds (up t 6 circuits), in varius building lcatins, are usually preferred t a large, central manifld (such as 10, 11, 12 r mre circuits).

11 CONTRACT #IT-201X-EN-0XX SYSTEMS PAGE 10 f 37 With large maniflds, the designer shuld cnsider the effect f manifld lcatin n the radiant heating system design and the impact f bringing numerus pipes in t ne area. Fr example, a 12 circuit manifld has 24 inlet/utlet pipes which result in a cngested pipe layut and an excessively warm area near the manifld. Based n the abve, determine the number f circuits fr each manifld. Zning the building usually increases the number f circuits resulting in maniflds with mre utlets. Preferably, a manifld will serve multiple thermal znes with similar heating requirements (such as exterir znes facing East, etc). Avid cnnecting cre areas and perimeter areas t the same manifld. The fluid flw fr each thermal zne shall be calculated based n the heat utput f the respective circuit, the nature f the fluid used (water, glycl) and the temperature differential (usually 20 O F r 11.1 O C). The fluid flw thrugh the manifld shall be calculated as the sum f all the circuits flws served by the respective manifld. Verify fluid velcities thrugh each pipe sectin; ensure that n pipe sectin cnveys fluid at mre than 4.5 fps (1.37 m/s) 3.13 Maniflds Lcatin Identify the manifld lcatin befre beginning the pipe layut. Use the fllwing criteria: Maniflds must always be installed within the heated space, and nt be lcated in an unheated area. Maniflds shuld be installed clse t the heating znes in a cnvenient lcatin fr bth the installatin and fr future accessibility (t reduce the length f pipe tails) Ensure that the maniflds fit in the available space Review the prximity t the heat surce t minimize the distributin piping Review the area security t prevent tampering, especially areas pen t the public. Review maintenance clearances Typical manifld lcatins include mechanical rms, clsets (behind an access panel), belw subflrs (munted hrizntally), underneath stairwells, inside cabinetry, in windw bxes r benches r hallways (in a recessed manifld cabinet)

12 CONTRACT #IT-201X-EN-0XX SYSTEMS PAGE 11 f Piping Layut Circuit cnnectins branch ff frm the manifld headers and balancing valves shall cntrl the flw rate t each circuit cnnectin. A valve actuatr shall be installed t the header balancing valve t pen and clse the circuit. Heat requirements are higher near exterir walls and windws and diminish tward the center f the rm. A 3 ft wide band alng the perimeter area f the building shall be supplied by separate supply and return maniflds and maintain a higher slab temperature; fr the perimeter band, it is permitted t serve multiple thermal znes frm a single pair f dedicated maniflds, prvided they face the same gegraphical rientatin. Fllwing are sme basic pipe layut recmmendatins: D nt run pipes under built-ins (e.g., cabinets, windw seats, large appliances, raised hearths, stairs) Keep pipes a minimum f 6 in (15 cm) away frm the edge f the slab, walls and nailing surfaces, and ther lcatins where plates, fixtures r built-ins might be fastened int the flr Keep balanced circuit lengths within 10% f each ther Design separate circuits fr different rms, allwing better rm temperature cntrl Keep area types reasnably sized D nt run circuit pipes acrss mvement jints Select the pipe size that is large enugh fr the applicatin Cunter Flw Spiral Pattern: with fewer bend radius cnstraints, cunter flw spirals allw clser pipe spacing and distribute heat mre evenly than serpentine patterns. Serpentine Pattern: prvides mre heat t the perimeter areas than t the interir f the rm, where ccupants are mre likely t gather. Typically, the mst effective way t heat a rm is t use a serpentine pattern at the edges and a cunter flw spiral pattern in the middle Pump Selectin Circulatr pumps shuld be sized t achieve the radiant system design flw rate. T size a pump, determine the required flw fr the radiant heating system and the ttal frictin lsses t be vercme frm all cmpnents. Use manufacturer-supplied tables fr pressure drp rates in under-slab pipes and fittings. Fr abve-grund rigid piping (cpper r steel) use infrmatin available in ASHRAE handbks t determine the pressure drps in pipes and fittings.

13 CONTRACT #IT-201X-EN-0XX SYSTEMS PAGE 12 f 37 The pump utlet pressure must nt exceed the embedded pipe ratings. Failure t fllw this instructin may damage the pipe resulting in leaks and peratinal failures Cntrl Strategies The temperature f the slab is cntrlled and limited by separate embedded sensrs, t prevent damage t the slab and flr cverings. The heating utput f the circuits served by each manifld is determined by a 3-way mixing valve at the interface between the in-flr heating secndary lp and the heating plant primary lp. The valve can cmbine fluid returning frm the under-flr lp with fluid supplied by the primary heat surce, t maintain the ptimum median fluid temperature in the under-flr piping system. The gal is t maintain the supply fluid at the pre-determined underflr cvering temperature and the ptimum temperature differential between the supply and return maniflds at between 18 O F and 22 O F (10 O C t 12.5 O C). The cmfrt level in each thermal zne is maintained by a space sensr; the space sensr has the ability t clse r pen a 2-way valve assciated with each circuit within a manifld. The tw-way valve may be 2-psitin r mdulating type. Outdr weather cmpensating cntrls (utdr reset cntrls) shall adjust the rate f heat delivered by the primary surce t mre clsely match the heat lss f a building, allwing the indr air temperature t remain relatively cnstant. The utdr reset cntrl measures the utdr air temperature, then calculates the target supply fluid temperature fr the radiant system. This target supply temperature is cnstantly updated thrughut the day as utdr cnditins change. The cntrl can perate upn the heat surce, upn a primary/secndary lp mixing valve r a variable speed injectin pump t adjust the heating fluid temperature tward the calculated target value. 4. GENERAL SYSTEM REQUIREMENTS 4.1 Certificatin Equipments Certificatin f flame spread/smke develpment rating f 25/50 in accrdance with ASTM E84 fr the fllwing PEX tubing sizes when installed un-insulated at a tube spacing nt less than 18 inches (457.2mm) apart. 4.2 Perfrmance Requirements: Prvide hydrnic radiant heating system that is manufactured, fabricated and installed t cmply with regulatry agencies and authrities with jurisdictin, and maintain perfrmance criteria stated by the PEX tubing manufacturer withut defects, damage r failure.

14 CONTRACT #IT-201X-EN-0XX SYSTEMS PAGE 13 f Regulatry Cmpliance Shw cmpliance with ASTM F877. Shw cmpliance with DIN 4726 regarding xygen diffusin cncerns. Shw cmpliance with ASTM E119 and ANSI/UL 263 thrugh certificatin listings thrugh Underwriters Labratries, Inc. (UL). 4.4 Manufacturer Credentials Hydrnic radiant system manufacturer shall have successfully cmpleted five installatins f similar type and scpe. Manufacturer shall prvide frm the factry a full-time representative t supervise the cmplete design, detailing, crdinatin, installatin and cmmissining f the hydrnic radiant system. The cntractr shall furnish all labr, materials, tls, equipment, appliances and services necessary t deliver and install all hydrnic radiant dimensins t the hydrnic radiant manufacturer. 5. SUBMITTALS 5.1 Prduct Data: Submit manufacturer s prduct submittal data and installatin instructins. 5.2 Submit the fllwing shp drawings, calculatins and reprts. Submit shp drawings fr piping installatin in the prject. Indicate all valves, pumps and items f equipment that are required t cntrl and perate the hydrnic radiant system fr heating and/r cling as shwn n the drawings and described in the sequence f peratins. Submit a valve and pump schedule listing each number, type, size, mdel and service. Crss reference t supprting prduct data. Submit manufacturer's detailed drawings shwing layuts, fixing details and piping details f all areas where hydrnic radiant systems are indicated alng with prduct and perfrmance data fr each cmpnent. Prvide calculatins that supprt the heating and/r cling perfrmance requirements f the hydrnic radiant system. These calculatins shuld shw the flw thrugh the system fr heating and/r cling as well as the primary heating and/r cling cnnectins t the radiant system headers and cntrl circuits. Prvide system pressure-drp calculatins as well. Submit drawings shwing details f maniflds, including all cnnectins and valves. If maniflds are t be installed n a wall, then the details shuld include all fixture details. If the maniflds are t be installed in wall cavities, then prvide all fixture and access details. Specify piping materials and temperature/pressure ratings. Prvide drawings shwing the lcatin f all expansin and penetratin sleeves, shwing crdinatin with cncrete slab expansin jints. Prvide cnfirmatin f cncrete slab expansin requirements and the use f any cncrete additives. Prvide drawings shwing piping manifld lcatins and installatin details.

15 CONTRACT #IT-201X-EN-0XX SYSTEMS PAGE 14 f 37 Prvide cntrl sequences and requirements fr cntrl hardware devices. Indicate cmpliance and crdinatin with requirements f ther specificatin sectins. Prvide piping sample with certificatin f prperties. Submit manufacturer's reprt detailing that the hydrnic radiant system has been installed in accrdance with this specificatin and the manufacturer's specified instructins. Submit reprt indicating that installatin was perfrmed accrding t the manufacturer's instructins. Include pressure testing dcumentatin as required in related specificatin sectins. Submit start-up reprt demnstrating that system meets required capacity, is fully functinal and cmmissined t the satisfactin f system manufacturer. Prvide installatin drawings indicating tubing layut, manifld lcatins, zning requirements and manifld schedules with details required fr installatin f the system. Prvide sectinal drawing f flr slab demnstrating crdinatin with ther cnstructin trades and shwing insulatin, if required. 5.3 Submit the fllwing supprt dcumentatin: Manufacturer s certificate indicating prducts cmply with specified requirements. Manufacturer s detailed rm-by-rm heat-lss analysis fr the structure. Dcumentatin indicating the installer is trained t install the manufacturer s prducts. 5.4 Submit the fllwing clse-ut dcuments. Warranty dcuments specified herein Operatin and maintenance data Manufacturer s field reprts specified herein Final as-built tubing layut drawing 6. DELIVERY, STORAGE AND HANDLING 6.1 Cmply with manufacturer s rdering instructins and lead-time requirements t avid cnstructin delays. 6.2 Deliver materials in manufacturer s riginal, unpened, undamaged cntainers with identificatin labels intact. 6.3 Stre materials prtected frm expsure t harmful envirnmental cnditins and at temperature and humidity cnditins recmmended by the manufacturer. 6.4 Stre PEX tubing in cartns r under cver t avid dirt r freign material frm entering the tubing. 6.5 D nt expse PEX tubing t direct sunlight fr mre than 30 days. If cnstructin delays are encuntered, cver the tubing t prevent expsure t direct sunlight.

16 CONTRACT #IT-201X-EN-0XX SYSTEMS PAGE 15 f WARRANTY 7.1 Warranty Perid fr PEX Tubing: 30-year, nn-prrated warranty against failure due t defect in material r wrkmanship, beginning with date f substantial cmpletin when installed by a factry-trained cntractr 7.2 Warranty Perid fr Maniflds and Fittings: 5-year, nn-prrated warranty against failure due t defect in material r wrkmanship, beginning with date f substantial cmpletin when installed by a factry-trained cntractr 7.3 Warranty Perid fr Cntrls and Electrical Cmpnents: 2-year, nn-prrated warranty against failure due t defect in material r wrkmanship, beginning with date f substantial cmpletin when installed by a factry-trained cntractr 7.4 Warranty may transfer t subsequent wners. 8. IN-FLOOR HEATING SYSTEM COMPONENTS 8.1 Tubing Material: Crss linked plyethylene (PEX) manufactured by PEX-a r Engle methd with an xygen diffusin barrier des nt exceed an xygen diffusin rate f 0.10 grams per cubic meter per day at 104 degrees F (40 degrees C) fluid temperature in accrdance with German DIN Pipe shall be rated fr cntinuus peratin f 100 psi gauge pressure at 180 F temperature ( C), and 80 psi gauge pressure at 200 F temperature ( C). Material Standard: Manufactured in accrdance with ASTM F876 and ASTM F877 and tested fr cmpliance by an independent third-party agency. Pressure Ratings: Standard Grade hydrstatic design and pressure ratings as issued by the Plastics Pipe Institute (PPI), a divisin f the Sciety f the Plastics Industry (SPI). Minimum Bend Radius (Cld Bending): N less than six times the utside diameter. Use the PEX tubing manufacturer's bend supprts if radius is less than stated. Pipe t have a Flame Spread Index f less than 25, and a Smke Develped Index f less than 50 when tested in accrdance with ASTM E84 (in U.S.) r CAN/ULC S102.2 (in Canada). The unrestrained linear expansin (thermal) rate fr the in-flr tubing shall be apprximately 1.1 inches per 10 F temperature change per 100 feet f tubing (16.5 mm/ O C-100m f tubing)

17 CONTRACT #IT-201X-EN-0XX SYSTEMS PAGE 16 f Maniflds 8.3 Fittings Install valved maniflds primarily fr wall-hung r bxed applicatins. Use maniflds with an islatin valve r a cmbinatin islatin and balancing valve n each utlet. Brass Maniflds (¼ diam) Fr system cmpatibility, use 1¼-inch brass maniflds ffered by the tubing manufacturer. Use maniflds cnstructed f dezincificatin-resistant brass. Use apprpriately sized maniflds bxes t allw the manifld assemblies t be munted inside the wall cavity. Use manifld munting brackets ffered by the tubing manufacturer. Maniflds must be capable f individual flw cntrl fr each lp n the manifld thrugh valve actuatrs available frm the manifld supplier. Maniflds must feature manual flw balancing capability within the manifld bdy fr balancing unequal lp lengths acrss the manifld. Install flw setter n the return leg frm the manifld t prvide flw balancing between maniflds. Maniflds supprt 5/16 inch thrugh ⅝ inch PEX tubing. Each manifld lcatin shuld have the ability t vent air manually frm the system. Cpper Maniflds (2 diam.) Fr system cmpatibility, use 2-inch valved cpper maniflds manufactured frm Type L cpper material, ffered by the PEX tubing manufacturer. Install valved cpper maniflds primarily fr wall-hung r bxed applicatins. Use maniflds with an islatin valve r a cmbinatin islatin and balancing valve n each utlet. Use maniflds that supprt ⅝ inch r ¾ inch PEX tubing. Ensure manifld end cap ffers tapping fr ⅛ inch FNPT and ½ inch FNPT fr vent and drain. Install supply-and-return piping t the manifld in a reverse-return cnfiguratin t ensure self-balancing. If the supply-and-return piping is in direct-return cnfiguratin, install and balance flw setters n the return leg f each manifld t the mains. Fittings shall be third-party certified t applicable standards ASTM F877, ASTM F2080 and CSA B137.5 as part f the manufacturer s PEX piping system, with independent listings frm IAPMO, NSF, CSA and ICC, as applicable. Cmpressin nut manifld fittings shall be manufactured f crrsin-resistant brass with a barbed insert and a reusable split cmpressin ring.

18 CONTRACT #IT-201X-EN-0XX SYSTEMS PAGE 17 f Accessries: Cmpressin-sleeve fittings shall be manufactured f brass and shall be supplied by the piping manufacturer as part f a prven catalged system. Fittings embedded within the thermal mass r encased behind walls r ceilings shall be cld-expansin cmpressin-sleeve fittings certified t ASTM F2080. Where required by the manufacturer, fittings shall be prtected frm external envirnmental cnditins. Pressure gauge n each manifld Temperature gauge n each manifld 8.5 Standards f Acceptance: Wirsb Upnr Stadler Rth 9. ABOVE GROUND PIPING BETWEEN HEAT SOURCE AND MANIFOLDS 9.1 Pipe And Tubing Steel: ASTM A53 Grade B, seamless r ERW, Schedule 40. Cpper: ASTM B88, Type K r L, hard drawn. Sft drawn tubing, 20 mm (3/4 inch) and larger, may be used fr runuts t flr munted fan cil units r perimeter cnvectrs 9.2 Fittings Fr Steel Pipe 65 mm (2 ½ inches) and Larger: Welded r flanged jints. Butt welding fittings: ASME B16.9 with same wall thickness as cnnecting piping. Elbws shall be lng radius type, unless therwise nted. 50 mm (2 inches) and Smaller: Screwed r welded. 150 pund malleable irn, ASME B pund cast irn, ASME B16.4, may be used in lieu f malleable irn. Bushing reductin f a single pipe size, r use f clse nipples, is nt acceptable. Unins: ASME B Fittings Fr Cpper Tubing Slder Jint: Jints shall be made up in accrdance with recmmended practices f the materials applied. Apply 95/5 tin and antimny n all cpper piping.

19 CONTRACT #IT-201X-EN-0XX SYSTEMS PAGE 18 f Screwed Jints Pipe Thread: ANSI B1.20. Lubricant r Sealant: Oil and graphite r ther cmpund apprved fr the intended service. 9.5 Valves Asbests packing is nt acceptable. All valves f the same type shall be prducts f a single manufacturer. Prvide gate and glbe valves with packing that can be replaced with the valve under full wrking pressure. Prvide chain peratrs fr valves 100 mm (4 inches) and larger when the centerline is lcated 2400 mm (8 feet) r mre abve the flr r perating platfrm. 9.6 Butterfly Valves Prvide stem extensin t allw 50 mm (2 inches) f pipe insulatin withut interfering with valve peratin. MSS SP 67, flange lug type (fr end f line service) r grved end rated 1205 kpa (175 psig) wrking pressure at 93 degrees C (200 degrees F). Bdy: Cast irn, ASTM A126, Class B. Malleable irn, ASTM A47 electr-plated, r ductile irn, ASTM A536, Grade electr-plated. Trim: Brnze, aluminum brnze, r 300 series stainless steel disc, brnze bearings, 316 stainless steel shaft and manufacturer's recmmended resilient seat. Resilient seat shall be field replaceable, and fully line the bdy t cmpletely islate the bdy frm the prduct. A phsphate cated steel shaft r stem is acceptable, if the stem is cmpletely islated frm the prduct. Actuatrs: Field interchangeable. Valves fr balancing service shall have adjustable memry stp t limit pen psitin. Valves 150 mm (6 inches) and smaller: Lever actuatr with minimum f seven lcking psitins, except where chain wheel is required. Valves 200 mm (8 inches) and larger: Enclsed wrm gear with handwheel, and where required, chain wheel peratr. 9.7 Ball Valves

20 CONTRACT #IT-201X-EN-0XX SYSTEMS PAGE 19 f 37 Brass r brnze bdy with chrme-plated ball with full prt and Tefln seat at 2760 kpa (400 psig) wrking pressure rating. Screwed r slder cnnectins. Prvide stem extensin t allw peratin withut interfering with pipe insulatin. 9.8 Water Flw Balancing Valves Fr flw regulatin and shut ff. Valves shall be line size rather than reduced t cntrl valve size and be ne f the fllwing types. Butterfly valve as specified herein with memry stp. 9.9 Gages, Pressure And Cmpund ASME B40.100, Accuracy Grade 1A, (pressure, vacuum, r cmpund fr air, il r water), initial mid scale accuracy 1 percent f scale (Qualify grade), metal r phenlic case, 115 mm (4 1/2 inches) in diameter, 6 mm (1/4 inch) NPT bttm cnnectin, white dial with black graduatins and pinter, clear glass r acrylic plastic windw, suitable fr bard munting. Prvide red "set hand" t indicate nrmal wrking pressure. Prvide brass lever handle unin cck. Prvide brass/brnze pressure snubber fr gages in water service. Range f Gages: Prvide range equal t at least 130 percent f nrmal perating range Thermmeters Mercury r rganic liquid filled type, red r blue clumn, clear plastic windw, with 150 mm (6 inch) brass stem, straight, fixed r adjustable angle as required fr each in reading. Case: Chrme plated brass r aluminum with enamel finish. Scale: Nt less than 225 mm (9 inches), range as described belw, tw degree graduatins. Separable Scket (Well): Brass, extensin neck type t clear pipe insulatin. Scale ranges may be slightly greater than shwn t meet manufacturer's standard. Required ranges in degrees C (F) 9.11 Pressure/Temperature Test Prvisins Pete's Plug: 6 mm (1/4 inch) MPT by 75 mm (3 inches) lng, brass bdy and cap, with retained safety cap, nrdel self clsing valve cres, permanently installed in piping where shwn, r in lieu f pressure gage test cnnectins shwn n the drawings. Prvide ne each f the fllwing test items t the Owner:

21 CONTRACT #IT-201X-EN-0XX SYSTEMS PAGE 20 f 37 6 mm ( ¼ inch) FPT by 3 mm (1/8 inch) diameter stainless steel pressure gage adapter prbe fr extra lng test plug. PETE'S 500 XL is an example. 90 mm (3 ½ inch) diameter, ne percent accuracy, cmpund gage, 100 kpa (30 inches) Hg t 700 kpa (100 psig) range degrees C (220 degrees F) pcket thermmeter ne half degree accuracy, 25 mm (ne inch) dial, 125 mm (5 inch) lng stainless steel stem, plastic case. 10. ABOVE-GROUND PIPING INSULATION 10.1 Fiberglass Pipe Insulatin Rigid mlded in cmpliance with ASTM C547, Class 1, minimum density 3.5 punds/cubic ft, K-factr f apprximately 0.24 at 75 degrees F, suitable fr temperatures frm minus 20 degrees F t 450 degrees F. Vapr Barrier: Factry applied vapr barrier all-service type with self-sealing lap and butt strips. Valves and Fitting Cvers: Pre-mlded PVC cvers with fiber glass insert. Manufacturers: Prt Crp., Ceelc Adhesive, Mastic, Cement ASTM C449: Mineral fiber hydraulic setting thermal insulating and finishing cement. Other: Insulatin manufacturers' published recmmendatins Mechanical Fasteners Wire: 1.3 mm thick (18 gage) sft annealed galvanized r 1.9 mm (14 gage) cpper clad steel r nickel cpper ally. Bands: 20 mm (3/4 inch) nminal width, brass, galvanized steel, aluminum r stainless steel Canvas Jacketing Apply in all expsed areas, including mechanical rms: cmpact, firm ULC listed heavy plain weave, cttn fabric at 220 g/m sq Metal Jacketing At all lcatins where the pipe is lcated utdrs r in heavy abuse areas, use metal jacketing t prtect piping r ductwrk insulatin.

22 CONTRACT #IT-201X-EN-0XX SYSTEMS PAGE 21 f 37 Jacketing: Aluminum, inches thick, embssed surface, with factry bnded misture barrier. Valve and Fitting Insulatin Cvers: Fabricate frm same material as jacketing r use prefabricated insulatin cvers made in tw matching halves. Metal Jacketing Bands: ½ inch wide, aluminum r stainless. 11. VERTICAL IN-LINE PUMPS 11.1 Pumps Refer t pump schedule fr pump flws and heads and mtr speed, enclsure, efficiency and pwer requirements and ther system cnditins. Pump Cnstructin: Pump Casing - Cast Irn with 125 psig ANSI/PN16 flanges fr wrking pressure belw 175 psig (12 bar) at 150 F (65 C) and Ductile Irn with 250 psig ANSI/PN25 flanges fr wrking pressures t 375 psig (25 bar) at 150 F (65 C). Suctin and discharge cnnectins shall be flanged and the same size and shall be drilled and tapped fr seal flush and gauge cnnectins. Impeller - Brnze, fully enclsed type. Dynamically balanced. Tw-plane balancing is required where installed impeller diameter is less than 6 times the impeller width. Shaft - Prvide Stainless Steel pump shaft. Cupling - Rigid spacer type f high tensile aluminum ally. Cupling t be designed t be easily remved n site t reveal a space between the pump and mtr shafts sufficient t remve all mechanical seal cmpnents fr servicing and t be replaced withut disturbing the pump r mtr. Mechanical Seals - Shall be Stainless Steel multi-spring utside balanced type with Vitn secndary seal, carbn rtating face and silicn carbide statinary seat. Prvide 316 stainless steel gland plate. Prvide factry installed flush line with manual vent. All split cupled pumps shall be prvided with a lwer seal chamber thrttle bushing t ensure seals maintain psitively cling and lubricatin. Seal flush line accessries, if required t imprve seal chamber cleanliness: Supply in the flush line t the mechanical seal a 50 micrn cartridge filter and sight flw indicatr, t suit the wrking pressure encuntered.

23 CONTRACT #IT-201X-EN-0XX SYSTEMS PAGE 22 f Vibratin islatrs Flexible pipe cnnectrs shall be used n all piping cnnected t rtating equipment (chiller, pumps, air handling equipment) t reduce the transmissin f nise and vibratin, and t eliminate stresses in piping systems due t misalignment and thermal mvement f the piping. Flexible cnnectrs shall be f the single- r duble-sphere mlded jint cnfiguratin and shall meet r exceed specificatins f the Rubber Expansin Jint Divisin, Fluid Sealing Assciatin. Cnnectrs shall be made f mlded neprene reinfrced with nyln tire crd and shall have mild steel flating flanges r female unin ends. Cntrl rds shall be used with unanchred systems r with spring-munted equipment where the pressures and mvements exceed thse the cnnectrs are designed t withstand Accessries Triple Duty Valve Furnish and install n the discharge side f each pump a triple duty cmbinatin valve. The valve is t incrprate the fllwing three functins in ne bdy: Tight shut-ff Spring-clsure type silent nn-slam check Effective thrttling design capability The bdy shall have tw ¼ cnnectins n each side f the valve seat. One cnnectin n each size shall have brass pressure and temperature metering prts, with Nrdel check valves and gasketed caps. The ther cnnectin n each side shall be supplied with brass drain plugs. Metering prts are t be interchangeable with drain plugs t allw fr measurement flexibility when installed in tight lcatins. The valve disk shall be brnze plug & disc type with high impact engineered resin seat t ensure tight shutff and silent check peratin. The valve stem shall be stainless steel with flat surfaces prvided fr adjustment with pen-end wrench. Suctin guide Furnish and install n the suctin f each pump a suctin guide, with utlet flw stabilizing guide vanes, remvable stainless steel strainer and fine mesh start-up strainer. Standard f Acceptance: Tac, Armstrng, Bell & Gssett

24 CONTRACT #IT-201X-EN-0XX SYSTEMS PAGE 23 f DIGITAL CONTROLS 12.1 General The digital cntrls perating the in-flr radiant heating shall be an extensin f the BAS perating the snw melting system. The same standards f acceptance will remain applicable as thse fr the snw selting system 12.2 Devices and Operatrs Outdr Air Temperature Sensrs Outdr temperature sensr supplied and installed with the snw melting system; the infrmatin cllected by the utdr temperature sensr shall be used by the BAS t perate and reset the in-flr heating system. Immersin Temperature Sensrs Prvide well-munted fluid temperature sensrs with the fllwing minimum characteristics: The sensrs shall be 10k hm thermistr encapsulated in a 6mm OD, 50m lng prbe, with screw fitting fr insertin int a standard thermwell. Operating range -10 t +100 degrees C. End-t-end accuracy +/- 0.3 C ver the entire perating range. The sensrs shall be cmplete with brass thermwell. Prvide a stainless steel thermwell where expsed t crrsive liquids. Use cnductive gel when munting the sensr in the thermwell. The sensrs t be munted n insulated piping shall be installed clear f the insulatin. Space Temperature Sensrs Temperature sensrs shall be Resistance Temperature Device (RTD). Uses a 100 hm thin film element t DIN (IEC 751) with a tlerance f 0.3 deg C. Lcal setpint verride with integrated slide ptentimeter. This prvides a variable 1 t 11K resistance signal at built-in terminals. The DDC panel can change the setpint by +/- 3 O C dependent n the resistance value. The plastic husing f these sensrs is suitable fr use in envirnments f up t 80 O C. End-t-end accuracy +/- 0.3 C ver the entire perating range.

25 CONTRACT #IT-201X-EN-0XX SYSTEMS PAGE 24 f 37 In-Slab Sensrs Ambient Cnditins: 32 F t 105 F (0 C t 41 C), 10% t 90% humidity (nn-cndensing) Sensr Type: 10K J-curve Tlerance: +/ F (+/- 0.3 C) Cnnectins: Terminal screws Sensr Length: 1" Lead Length: 10' Diameter (OD): 0.37" Current Sensrs (Analg) Current sensrs (CT) shall be used fr status mnitring f all mtr-driven equipment, where specified. Technical Perfrmance Output shuld be nly 4-20mA nly. Vltage utput will nt be accepted. End-t-end accuracy +/- 1% f full scale at each range. The current sensrs shall be munted inside the starter cabinets whenever pssible. If this is nt pssible due t space limitatin, prvide an enclsure t huse the sensr. Status Relays (Slid State) The status relays shall be munted inside newly prvided enclsures munted near the respective equipment starter cabinets. Autmatic Cntrl Valves Autmatic cntrl valves shall be supplied by the Cntrls Cntractr and installed by the Mechanical Cntractr. Autmatic cntrl valves, unless therwise specified, shall be glbe type valves. Valves and actuatrs shall be rdered as ne factry-assembled and tested unit. Submit t the Cnsultant fr review, a valve schedule cntaining the fllwing infrmatin fr each valve: Valve type and size Cnnectin type Line size Valve manufacturer and mdel number Valve flw cefficient Design flw Pressure drp acrss valve Maximum clse-ff pressure Actuatr manufacturer and mdel number Actuatr maximum trque

26 CONTRACT #IT-201X-EN-0XX SYSTEMS PAGE 25 f 37 Valves 2 (50mm) and smaller shall be cnstructed f brnze. Valves 2½ (65mm) and larger shall have irn bdies and brnze muntings. All cntrl valves shall have stainless steel stems. The brnze in bdies and bnnets f all brnze valves shall cnfrm t ASTM B62 fr valves rated up t 150psig (1035 Kpa) wrking pressure and t ASTM B61 fr valves rated at 200 psig (1380 Kpa) wrking pressure. The bdies and bnnets f irn bdy valves shall cnfrm t ASTM A126, Class B. Cntrl valve discs and seats shall be f brnze fr 100 C r less fluid temperature and f stainless steel fr fluid temperatures abve 100 C. The cntrl valves shall have tight shut-ff. Flat disk valves are nt acceptable. Cntrl valves 2 (50mm) and smaller shall be cmplete with screwed ends type, except fr brnze valves installed in sldered cpper piping which shall be cmplete with sldering ends. Cntrl valves larger than 2 (50mm) shall be cmplete with flanged end type and prper flanged adapters t cpper shall be prvided where flanged valves are installed in cpper piping. The fluid cntrl valves shall be sized fr a pressure drp f 6 ft. water clumn r as indicated n mechanical drawings. Each autmatic cntrl valve must prvide the design utput and flw rates at pressure drps cmpatible with equipment selected. Each autmatic cntrl valve must be suitable fr the particular system wrking pressure. Each autmatic cntrl valve shall be fitted with a psitin indicatr. All the same type cntrl valves shall be the prducts f a single manufacturer and have the manufacturer s name, pressure rating and size clearly marked n the utside f the bdy. Unless therwise indicated, cntrl valves fr prprtinal peratin shall have equal percentage characteristics, while the cntrl valves fr pen/shut tw-psitin peratin shall have straight line flw characteristics. Autmatic Cntrl Valve Actuatrs Each autmatic cntrl valve shall be fitted with a fail-safe peratr capable f tight shut-ff against the differential impsed by the system. Operatrs fr valves in electric-electrnic cntrl systems shall be single phase AC, 24V electric mtr peratrs. Valve actuatrs n valves 3 diameter and larger shall be prvided with a manual psitin verride. Valve actuatrs shall accept a 0-10VDC r 4-20mA cntrl signal fr all prprtinal applicatins. Flating pint cntrl f valves is nt acceptable under any circumstances. By-pass Relief valve Self-acting autmatic differential pressure by-pass valve used in multi-znes systems that have fluctuatins in flw due t transient pening and clsing f znes.

27 CONTRACT #IT-201X-EN-0XX SYSTEMS PAGE 26 f 37 The valve is supplied with male NPT thread Setting range: 1.67 t feet f head (5 kpa t 50 kpa) Max. differential: feet f head (50 kpa) Max. perating pressure: 145 psi (1,000 kpa) Max. flw temperature: 248 F (120 O C) Max. leakage at clsed valve: 0.22 gpm (0.83 l/min) LAN Cabling 13. EXECUTION 13.1 Examinatin All LAN cabling shall be Categry V as defined by EIA/TIA 568A. The cntractr shall test all cabling t verify that 100Mb bandwidth is supprted. See cmmissining requirements. Cabling shall be 4 pair, 100 hm UTP, #24 AWG slid cpper cnductr PVC insulated, with blue r grey clur cded jacket. FT6 rated cable shall be used unless therwise required t meet building cdes r by-laws. Data utlets shall be RJ45, 8 pin cnnectrs, with 50 micrns f hard gld ver nickel, minimum durability f 750 mating cycles and cntact pressure f 100 grams per cntact. Transmissin characteristics shall meet TSB-40 Categry V. Prvide ne RJ45 data utlet adjacent t each device t be terminated (e.g. wrkstatin PC, DDC panel, hub, etc.) Use a flexible patch cable t cnnect frm the data utlet t the end device. Prvide prtectin frm EMI surces in accrdance with CSA-T530 article 4 The cntractr shall test all cabling t verify cnfrmance with TIA /EIA TSB-67 - Basic Link Test using a Level 2, bi-directinal tester. See cmmissining requirements. Where there are mre than 2-90 degree in a cnduit run, prvide a pull bx between sectins s that there are tw bends r less in any ne sectin. Where a cnduit run requires a reverse bend, between 100 degrees and 180 degrees, insert a pull bx at each bend having an angle frm 100 degrees t 180 degrees. Ream all cnduit ends and install insulated bushings n each end. Terminate all cnduits that prtrude thrugh the structural flr 2 abve the cncrete base. D nt use a pull bx in lieu f a cnduit bend. Align cnduits that enter a pull bx frm ppsite ends with each ther. Verify that site cnditins are acceptable fr installatin f the hydrnic radiant heating system. Inspect the cnditin f the building site. The sub-grade shuld be level and drained; if required, a vapr barrier is installed; insulatin is installed and is f crrect type and thickness; wire mesh r rebar is installed crrectly, and will nt be mved after installatin f pipe; the subflr is prperly installed. Crrect any discrepancies befre installing pipe.

28 CONTRACT #IT-201X-EN-0XX SYSTEMS PAGE 27 f 37 Inspect the site fr pssible hazards that culd damage the flexible pipe, such as nails, staples, materials r tls frm ther trades, r chemicals that culd spill and damage the pipe. Eliminate r remve any items r ptential hazards befre installing pipe. D nt prceed with installatin f the hydrnic radiant heating system until unacceptable cnditins are fully met In-Flr Tubing Installatin - Cncrete Slab-n-Grade Sub-grade shuld be cmpacted, flat and smth t prevent damage t pipe r insulatin. Apprved vapr barrier material shuld be installed. Apprved thermal insulatin, accrding t the design, shall be installed. If the design requires under-slab insulatin, the structural engineer determines the vertical cmpressive strength f the high-density extruded bard insulatin. The radiant flr design determines the required insulatin resistance value (R-value). Use edge insulatin when the heated system directly cntacts an exterir wall r beam. Reinfrcing wire mesh, if required by structural design, must be flat and level, with all sharp ends pinting dwn. Fasten the tubing t the flat mesh r reinfrcing bar in accrdance with the tubing manufacturer s installatin recmmendatins. Install tubing at a cnsistent depth belw the surface elevatin as determined by the prject engineer. Ensure sufficient clearance t avid cntrl jint cuts. In areas where tubing must crss metal expansin jints in the cncrete, ensure the tubing passes belw the jints. Depending n the manufacturer's and structural engineer's recmmendatin, fibrus expansin jints may tlerate penetratin. Finished grade f the thermal mass must be a minimum f ¾ inch (19 mm) abve the tp f PEX heating pipes. D nt install tubing within 6 inches (152mm) f any wall. Refer t the submitted radiant flr design layut fr actual n-center infrmatin. Flexible pipe must be fastened at least every 36 (90 cm) when installed n wire mesh, insulatin, r a wd subflr. Pipe must be fastened at the beginning, midpint and end f each 180 bend Fr tubing that exits the slab in a 90-degree bend, use metal r PVC bend supprts. Preparatin f wall cavity fr Manifld installatin: